![theorbo theorbo](https://www.tekportal.net/wp-content/uploads/2018/11/theorbo.jpg)
noun, plural the·or·bos.
- an obsolete bass lute with two sets of strings attached to separate peg boxes, one above the other, on the neck.
noun plural -bos
- music an obsolete form of the lute, having two necks, one above the other, the second neck carrying a set of unstopped sympathetic bass strings